Colourful coat with a name in it (6)
I believe the answer is:
enamel
'colourful coat' is the definition.
'enamel' can be an answer for 'coat' (enamel is a kind of coat). I'm not sure about the 'colourful' bit.
'name in it' is the wordplay.
'in' is an insertion indicator.
'it' becomes 'el' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'name' going within 'el' is 'ENAMEL'.
'with a' is the link.
Can you help me to learn more?
(Other definitions for enamel that I've seen before include "Hard material" , "protection for canines?" , "hard cover" , "Nail polish" , "Hard shiny coating on surface" .)